US4128611A - Continuous process and apparatus for producing foamed polymer bunstock having a substantially rectangular cross-section - Google Patents

Continuous process and apparatus for producing foamed polymer bunstock having a substantially rectangular cross-section Download PDF

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Publication number
US4128611A
US4128611A US05/785,404 US78540477A US4128611A US 4128611 A US4128611 A US 4128611A US 78540477 A US78540477 A US 78540477A US 4128611 A US4128611 A US 4128611A
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US
United States
Prior art keywords
foam
panel member
conveyor
bunstock
mold
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/785,404
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English (en)
Inventor
Richard A. Kolakowski
Richard M. Stroud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Chemical Co
Original Assignee
Upjohn Co
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Filing date
Publication date
Application filed by Upjohn Co filed Critical Upjohn Co
Priority to US05/785,404 priority Critical patent/US4128611A/en
Priority to GB9644/78A priority patent/GB1595405A/en
Priority to FR7810221A priority patent/FR2386410A1/fr
Priority to NL7803744A priority patent/NL7803744A/xx
Priority to DE2815160A priority patent/DE2815160B2/de
Priority to BE186655A priority patent/BE865807A/fr
Application granted granted Critical
Publication of US4128611A publication Critical patent/US4128611A/en
Assigned to DOW CHEMICAL COMPANY, THE reassignment DOW CHEMICAL COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UPJOHN COMPANY, THE,
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/467—Foam spreading or levelling devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/84—Conversion of foamed resinous buns into foamed billets having geo metrical crosssections

Definitions

  • polymer foam such as polyurethane, polyisocyanurate and like rigid foams
  • U-shaped mold comprised of a lower conveyor belt and side panels moving in synchronized manner
  • the bunstock so produced is then generally cut to fabricate sheets, boardstock and the like for insulation purposes.
  • the bunstock be produced with substantially rectangular cross-section.
  • U.S. Pat. No. 3,655,311 describes the use of a tunnel shaped mold having a rectangular cross-section and having the top formed by a series of plates yieldably mounted so that they could be displaced upwardly if the rising foam exerted pressure thereon in excess of a predetermined level.
  • U.S. Pat. Nos. 3,965,228 and 3,998,575 describe respectively a process and apparatus for preparing substantially flat top foam bunstock by subjecting the lateral edges of the rising foam to the lifting action of a plurality of endless wires thereby seeking to overcome the drag exerted on said edges by friction between the rising foam and the sidewalls of the U-shaped mold employed to prepare the bunstock.
  • U.S. Pat. Nos. 3,091,811; 3,719,734; 3,751,197; 3,809,512; 3,812,227 and 3,965,228 describe closely related apparatus and processes for achieving the same result using forces exerted by side papers moving at an inclination to the vertical corresponding approximately to the profile of the rising foam.
  • U.S. Pat. No. 3,768,937 describes a similar process in which air or gas filled elongated tubular sheets are fed along the sides of the rising foam in an otherwise conventional bunstock apparatus and are caused to rise in approximate synchronization with the profile of the rising foam so as to minimize frictional drag on the edges of the rising foam.
  • U.S. Pat. No. 3,325,823 describes a process in which an effect similar to that in which the side papers are moved upwardly is achieved by moving the side papers in the conventional manner but causing the rising foam to be moved downwardly so that a relative upward force is exerted by the side papers on the edges of the foam.
  • U.S. Pat. No. 3,984,195 describes a process for producing bunstock with a substantially rectangular cross-section by applying molding pressure on the rising foam by means of a plurality of rollers and the like throughout the major part of its rise profile as well as passing the initially deposited foam mix through a nip roll to achieve uniform thickness in the poured foam prior to rise.
  • U.S. Pat. No. 3,123,856 discloses a process in which elevated portions are provided in the center of the initial section of the floor of the moving U-shaped mold.
  • the foam in the central portions of the mold accordingly rises initially to a greater height than the foam on the outer edges of the mold. Once the foam moves off the elevated section of the mold and reaches the section having a planar floor, the central portions of the foam subside thereby tending to form a more planar surface on the bunstock than that achieved by using a conventional bunstock molding apparatus.
  • U.S. Pat. No. 3,887,670 discloses the use in an otherwise conventional bunstock line of a combination of weirs and a pour board which has a profile corresponding to the mirror image of the rise profile of the rising foam whereby the frictional drag on the sides of the foam is minimized and a substantially rectangular cross-section is achieved in the resulting foam bunstock.
  • French application No. 74 27210 has described a process in which the rising foam is subjected, in an otherwise conventional foam bunstock apparatus, to the molding action of a fixed plate which straddles the rising foam at a point very close to the beginning of foam rise and which confines the foam to a particular configuration over the majority of the rise profile.
  • British specification No. 1,465,900 which issued after the present invention was completed, teaches the application of pressure to the rising foam over substantially the whole rise profile by means of a sheet contoured to match said rise profile.
  • This invention comprises a process for producing a continuous length of polymer foam bunstock having substantially rectangular cross-section, uniform density and uniform cell structure, which process comprises the steps of:
  • the invention also comprises apparatus for carrying out said process which apparatus will be described in detail hereinafter.
  • FIG. 1 is a side elevational view, partially in cutaway schematic form, of a conveyor system for the production of polymer foam bunstock.
  • FIG. 1A is a cross-sectional view taken along the line A--A of the conveyor system shown in FIG. 1.
  • FIG. 2 is an enlarged view of a portion of the conveyor system shown in FIG. 1 over which the foam rise takes place.
  • FIG. 3 is a cross-sectional view of polymer foam bunstock produced in accordance with prior art methods.
  • FIGS. 4, 5 and 7 are cross-sectional views of polymer foam bunstock produced in accordance with the present invention.
  • FIG. 6 is a plan view of the conveyor system for production of polymer foam bunstock shown in FIG. 1.
  • FIG. 8 is an enlarged view of a portion of the conveyor system shown in FIG. 1 showing another embodiment in accordance with the present invention.
  • the various components of the polymer foam forming mixture are fed to the mixing head 2 via hoses 4.
  • the foam mix 6 is dispensed from the mixing head 2 on to a continuously advancing paper web 8 which is fed from roll 10.
  • the mixing head is suspended from a bridge (not shown) and is caused to traverse back and forth across the width of the paper web 8 in a direction at right angles to the direction in which said paper web 8 is advanced.
  • the paper web 8 is supported on, and moves synchronously with, an endless conveyor belt 12 which latter is in turn supported by roller bars 14.
  • the endless belt is replaced by a smooth metal plate over which the paper 8 is made to slide by appropriate pulling means applied to the paper.
  • the outer edges of the latter are folded upwardly by appropriate folding means (not shown) so as to retain liquid foam mix on said paper web after deposit thereon.
  • the bed of the conveyor, formed by the endless belt 12 moving on roller bars 14, is inclined at an angle of about 4°-8° to the horizontal and slopes downwardly away from the point of deposit of foam mix 6.
  • FIG. 1A is a cross-sectional view of the conveyor taken through the line A--A in FIG. 1.
  • a paper web 23 is also dispensed from paper roll 21 and led via roller bars 25 and 27 to the top surface of the rising foam.
  • the expanding foam mix gradually rises and, at a location near the top of the rise, shown in FIG. 1 and more clearly in the detailed view of this section of the conveyor shown in FIG. 2, the rising foam makes contact with the undersurface of a panel member 26.
  • the latter is suspended from a bracket 29 in an overhead beam or gantry 28 by means of suspension member 30 which can take the form of a flexible or rigid rod, chain, rope or the like.
  • the suspension member 30 is pivotally attached at its lower end 32 to the downstream end, i.e., the end remote from the location of foam deposit, of said panel member 26 by pivot member 34.
  • the latter can be an appropriate hinge, coupling ring, hook and eye, and the like. While the suspension of the downstream end of the panel member 26 from the overhead beam or gantry 28 can be achieved by using a single suspension member 30 it is preferred to employ two such members mounted in parallel in a vertical plane at right angles to the direction of the advancing foam.
  • the panel member 26 slopes downwardly away from the pivotal mounting 34 and suspension member 30 and is provided, towards its other end 36, with a rope or chain 40 attached thereto by a second pivot member 38.
  • the rope or chain 40 serves to raise or lower the panel member 26, via pulley means 42, to any desired position either before or during operation of the bunstock formation.
  • the lower end 36 of the panel member is not supported by the rope or chain 40 during operation of the process of the invention. Rather, the panel member depends from pivot member 34 and its lower end floats freely on the surface of the rising foam and is in tangential contact with the latter at a location between the points represented by X and Y in the rising foam.
  • the location X represents the point in the rise of the foam at which the latter has reached the gel point.
  • the location Y represents the point at which the foaming process has advanced to the stage at which the foam no longer has sufficient mobility to be subjected to molding forces, such as those exerted by the panel member 26, without deleterious effect on the cell structure and or other desirable physical properties of the foam.
  • FIG. 3 shows a cross-section of a typical polymer foam bunstock which has been produced without the aid of applicants' invention and without the aid of any other method of seeking to achieve rectangular cross-section. It will be seen that the foam in question has a high crown 44 which would have to be removed by cutting along the plane shown by the dotted line in order to produce a bun adapted for cutting into boardstock and the like. This obviously involves the discarding of a substantial amount of potentially valuable polymer foam represented by the crown of the bun.
  • FIG. 4 shows a typical cross-section of a bunstock produced in accordance with applicants' invention and clearly illustrates the effect of the pressure exerted on the rising foam in the critical region discussed above.
  • the crown 42 shown in the typical foam in FIG. 3 has disappeared and the top 46 of the foam is substantially flat and requires no significant trimming before being cut into bunstock.
  • the force which the panel member 26 exerts on the rising foam in the critical region between locations X and Y is dependent on the weight of said panel member and also on the distance between the pivot member 34 and the point of tangential contact between the underside of the panel member 26 and the foam.
  • the weight of the panel member 26 can obviously be controlled by appropriate choice of the material from which the panel member is fabricated and by the total size of said panel member.
  • a sheet of 3/4 inch plywood having dimensions 4 ⁇ 10 feet with two lengthwise reinforcing struts of 2 ⁇ 4 inch studs forms a highly satisfactory panel member when provided with pivot members 34 located about one foot from the downstream end of said member and allowed to depend at an angle to the floor of the conveyor of up to about 30°.
  • the angle employed for any particular foam will vary according to location of the points X and Y in the rise profile of said foam. For example, in the case of a polyurethane foam the point Y is located very close to the top of the rise and the angle of the panel member to the horizontal can be close to 0°. In the case of an isocyanurate foam the point Y occurs earlier in the profile and the angle made by the panel member to the horizontal is greater.
  • the panel member 26 can be constructed of other types of material such as reinforced plastic, fiberboard, and the like and the exact choice thereof is not critical to success of operation of the process of the invention provided the weight of said panel member 26 does not exceed the appropriate limit.
  • the underside of the panel member 26, i.e., the surface in contact with the foam, can be planar or convex downwardly across its width. Further, said surface can be coated with appropriate materials such as formica and the like to reduce friction between said underside and the top paper on the foam.
  • the precise weight and dimensions of the panel member 26 to be employed for any particular polymer foam forming system can be determined readily by a process of trial and error. Fine tuning of the weight of the panel member 26 can be achieved during actual operation of the bunstock line by addition of appropriate weights 47 to the lower end of the panel member 26 when it is desired to increase the force exerted by the panel member 26 on the foam.
  • the weights 47 can take any convenient form such as bricks, metal blocks, sandbags and the like.
  • the suspension member 30 and the rope or chain 40 are shown as disposed substantially vertically with respect to the conveyor. This will, in fact, be the case if the suspension member 30 is rigidly fastened to the bracket member 29 and is not free to move. However, where the suspension member 30 is hingeably attached to the bracket 29, and is therefore free to pivot about said bracket, it is found that the pressure exerted by the foam on the underside of the panel member 26 will cause the latter to be displaced in the direction of travel of the conveyor so that suspension member 30 and rope or chain 40 will be disposed at an acute angle to the vertical. This embodiment is illustrated in FIG.
  • FIG. 7 shows the cross-sectional configuration of a typical foam bunstock at two stages in its development.
  • the configuration shown in solid lines 50 is that attained by the foam after the completion of the initial rise period.
  • the configuration shown in dotted lines 52 is that attained after all expansion of the foam is complete. In the case of a foam bun having a width of about 48 inches, the difference between the initial configuration 50 and the final configuration 52 is generally of the order of several inches.
  • FIG. 6 shows a plan view of the pertinent portion of the bunstock conveyor shown in side elevation in FIG. 1.
  • the conveyor is shown moving from left to right as indicated by the arrow.
  • the side belts 22 and supporting rollers 24 are displaced sideways in a gradually increasing manner so that the increasing width of the conveyor between the inner sides of the side belts 22 will conform to the gradual sideways expansion of the foam bunstock in this region.
  • the exact configuration required in this region, including the distance between the locations P--P and Q--Q, to accommodate any particular foam system can be readily determined by a process of trial and error.
  • the adjustment of the side belts 22 and rollers 24 can be carried out during actual operation of the foam bunstock conveyor to meet the needs of the particular foam being processed.
  • a constant check can be made, during operation of the conveyor, for the existence of constraining forces exerted by the side belts 22 on the abutting side of the foam bunstock.
  • a simple test which can be used for this purpose consists of sliding, or attempting to slide, a thin strip of material downwardly between the edge of the foam and the side belt. If, at any point along the conveyor, there is excessive resistance to such insertion of the thin strip, the appropriate adjustment of the position of the pertinent section of side belt 22 is effected until the resistance to insertion is removed. Similarly, any overadjustment of the position of the side belts 22 in a given location can be detected and corrected.
  • the foam bunstock After the foam bunstock has passed through the region shown in FIG. 6, it is then caused to proceed down the conveyor to a cutting and unloading station (not shown) where the bunstock is cut into appropriate lengths and removed from the conveyor in accordance with procedures well-known in the art.
  • the process of the invention has a number of advantages over processes previously known in the art. Not only is it extremely simple to operate, requiring no sophisticated apparatus or attachments to conventional foam machinery, but it is readily adaptable to use with a wide variety of polymer foam forming systems exhibiting different foam rise characteristics and rise profile. Thus, in the case of any particular foam system, it is merely necessary to identify the appropriate area of contact for the panel member in the rise profile and to adjust the position of the panel member to accommodate the situation. Further, in the operation of the process of the invention with any particular system, there is generally no reason to adjust the position of the panel member during the operation. The panel member, being free to float on the surface of the foam will accommodate itself readily, without the need for manual operation, to minor variations in height of foam rise caused by minor variations in speed of the conveyor system.
  • the appearance of the foam cross-section as the bunstock passes down the conveyor provides a ready check on the correct pressure being applied to the rising foam and permits correction, by modifying the weight applied to the panel member, in a rapid and facile manner.
  • the cell structure and dimensional strengths of the foam bunstock produced in accordance with the process of the invention are generally excellent and superior to those which can be achieved by methods hitherto employed.
  • the dimensional strength of the foam measured in a direction horizontal to the conveyor but at right angles to the direction of travel is generally equal to that in the direction horizontal to the conveyor and in the direction of travel whereas, in foam produced by previous methods, the strength in the latter dimension was usually inferior because of excessive pressure exerted on the foam during its rise.
  • the dimensional strength in the direction of foam rise is greatest and is excellent in the foams produced in accordance with the invention.

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  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US05/785,404 1977-04-07 1977-04-07 Continuous process and apparatus for producing foamed polymer bunstock having a substantially rectangular cross-section Expired - Lifetime US4128611A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US05/785,404 US4128611A (en) 1977-04-07 1977-04-07 Continuous process and apparatus for producing foamed polymer bunstock having a substantially rectangular cross-section
GB9644/78A GB1595405A (en) 1977-04-07 1978-03-10 Process and apparatus for preparing polymer foam
FR7810221A FR2386410A1 (fr) 1977-04-07 1978-04-06 Procede et appareil de preparation de pains de mousse de matiere plastique de longueur indefinie
NL7803744A NL7803744A (nl) 1977-04-07 1978-04-07 Werkwijze en inrichting voor het vervaardigen van schuimpolymeer.
DE2815160A DE2815160B2 (de) 1977-04-07 1978-04-07 Verfahren und Vorrichtung zur Herstellung eines ununterbrochenen bzw. endlosen Polymerschaumstrangs
BE186655A BE865807A (fr) 1977-04-07 1978-04-07 Procede et appareil de preparation de pains de mousse de matiere plastique de longueur indefinie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/785,404 US4128611A (en) 1977-04-07 1977-04-07 Continuous process and apparatus for producing foamed polymer bunstock having a substantially rectangular cross-section

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US4128611A true US4128611A (en) 1978-12-05

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US05/785,404 Expired - Lifetime US4128611A (en) 1977-04-07 1977-04-07 Continuous process and apparatus for producing foamed polymer bunstock having a substantially rectangular cross-section

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US (1) US4128611A (fr)
BE (1) BE865807A (fr)
DE (1) DE2815160B2 (fr)
FR (1) FR2386410A1 (fr)
GB (1) GB1595405A (fr)
NL (1) NL7803744A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267135A (en) * 1980-01-21 1981-05-12 The Upjohn Company Process and apparatus for the continuous molding of polymer foam bunstock having a substantially rectangular cross-section
US4267134A (en) * 1979-09-24 1981-05-12 The Upjohn Company Method and apparatus for smoothing foamed plastic core panelboard surface
WO1986001149A1 (fr) * 1984-08-06 1986-02-27 Crest-Foam Corp. Pains polymeres; procede et appareil de production
US5397524A (en) * 1991-05-06 1995-03-14 Godonco Industries, Inc. Apparatus and method for manufacturing concrete form mouldings
US5527172A (en) * 1994-04-15 1996-06-18 Carpenter Co. Apparatus for forming a foam product
US5587182A (en) * 1994-02-21 1996-12-24 Maschinenfabrik Hennecke Gmbh Apparatus for the production of endless polyurethane moldings
US6036898A (en) * 1997-01-24 2000-03-14 Hennecke Gmbh Process for the continuous production of polyurethane slabstock foam
US20030183971A1 (en) * 2000-08-08 2003-10-02 Griffiths Anthony Charles Murray Foam plastics manufacturing method and machine
US20050067728A1 (en) * 2000-11-08 2005-03-31 Hans-Michael Sulzbach Process and apparatus for the continuous production of slabstock foam
US20070252298A1 (en) * 2006-04-26 2007-11-01 Sealed Air Corporation (Us) Method and apparatus for making foam-in-place cushions with selective distribution of foam

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924185A1 (de) * 1979-06-15 1981-01-08 Bayer Ag Einrichtung zum kontinuierlichen herstellen von schaumstoffbloecken oder schaumstoffbahnen

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US3208103A (en) * 1962-11-30 1965-09-28 Union Carbide Corp Gas chamber for applying pressure to continuous strips of plastic
US3240846A (en) * 1962-08-06 1966-03-15 Allied Chem Method and apparatus for preparing polyurethane foam sandwich structure
US3354503A (en) * 1964-04-02 1967-11-28 Gen Tire & Rubber Co Urethane foaming apparatus
US3553300A (en) * 1968-07-10 1971-01-05 Tenneco Chem Process for controlling the upper surface contour of foamable polyurethane during expansion in an open top mold
US3984195A (en) * 1974-02-20 1976-10-05 Planiblock, S.A. Continuous production of planar expanded polyurethane blocks

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US3734668A (en) * 1970-11-18 1973-05-22 Upjohn Co Apparatus for forming urethane foam stock
CH582057A5 (fr) * 1974-07-15 1976-11-30 Plasco Sa
DE2517664C3 (de) * 1975-04-22 1981-06-19 Metzeler Schaum Gmbh, 8940 Memmingen Verfahren zur kontinuierlichen Herstellen von rechteckigen Schaumstoffblöcken

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3240846A (en) * 1962-08-06 1966-03-15 Allied Chem Method and apparatus for preparing polyurethane foam sandwich structure
US3208103A (en) * 1962-11-30 1965-09-28 Union Carbide Corp Gas chamber for applying pressure to continuous strips of plastic
US3354503A (en) * 1964-04-02 1967-11-28 Gen Tire & Rubber Co Urethane foaming apparatus
US3553300A (en) * 1968-07-10 1971-01-05 Tenneco Chem Process for controlling the upper surface contour of foamable polyurethane during expansion in an open top mold
US3984195A (en) * 1974-02-20 1976-10-05 Planiblock, S.A. Continuous production of planar expanded polyurethane blocks

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267134A (en) * 1979-09-24 1981-05-12 The Upjohn Company Method and apparatus for smoothing foamed plastic core panelboard surface
US4267135A (en) * 1980-01-21 1981-05-12 The Upjohn Company Process and apparatus for the continuous molding of polymer foam bunstock having a substantially rectangular cross-section
WO1986001149A1 (fr) * 1984-08-06 1986-02-27 Crest-Foam Corp. Pains polymeres; procede et appareil de production
US4605683A (en) * 1984-08-06 1986-08-12 Crest-Foam Corporation Polymeric buns and method and apparatus for its manufacture
US5397524A (en) * 1991-05-06 1995-03-14 Godonco Industries, Inc. Apparatus and method for manufacturing concrete form mouldings
US5587182A (en) * 1994-02-21 1996-12-24 Maschinenfabrik Hennecke Gmbh Apparatus for the production of endless polyurethane moldings
US5527172A (en) * 1994-04-15 1996-06-18 Carpenter Co. Apparatus for forming a foam product
US6036898A (en) * 1997-01-24 2000-03-14 Hennecke Gmbh Process for the continuous production of polyurethane slabstock foam
US20030183971A1 (en) * 2000-08-08 2003-10-02 Griffiths Anthony Charles Murray Foam plastics manufacturing method and machine
GB2365814B (en) * 2000-08-08 2003-10-29 Cannon Viking Ltd Foam plastics method and machine
US7179410B2 (en) 2000-08-08 2007-02-20 Cannon Viking Limited Foam plastics manufacturing method and machine
US20050067728A1 (en) * 2000-11-08 2005-03-31 Hans-Michael Sulzbach Process and apparatus for the continuous production of slabstock foam
US7101163B2 (en) * 2000-11-08 2006-09-05 Hennecke Gmbh Process and apparatus for the continuous production of slabstock foam
US20070252298A1 (en) * 2006-04-26 2007-11-01 Sealed Air Corporation (Us) Method and apparatus for making foam-in-place cushions with selective distribution of foam
US20090243135A1 (en) * 2006-04-26 2009-10-01 Sealed Air Corporation Method and apparatus for making foam-in-place cushions with selective distribution of foam
US7607911B2 (en) 2006-04-26 2009-10-27 Sealed Air Corporation (Us) Method and apparatus for making foam-in-place cushions with selective distribution of foam
US8182254B2 (en) 2006-04-26 2012-05-22 Sealed Air Corporation (Us) Method and apparatus for making foam-in-place cushions with selective distribution of foam
US8501061B2 (en) 2006-04-26 2013-08-06 Sealed Air Corporation (Us) Method for making foam-in-place cushions with selective distribution of foam

Also Published As

Publication number Publication date
FR2386410B1 (fr) 1983-10-14
GB1595405A (en) 1981-08-12
NL7803744A (nl) 1978-10-10
BE865807A (fr) 1978-10-09
FR2386410A1 (fr) 1978-11-03
DE2815160B2 (de) 1980-09-25
DE2815160A1 (de) 1978-11-02

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AS Assignment

Owner name: DOW CHEMICAL COMPANY, THE, 2030 DOW CENTER, ABBOTT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UPJOHN COMPANY, THE,;REEL/FRAME:004508/0626

Effective date: 19851113